- 1. a. Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. Source: opted
- 2. n. The Ordovician formation. Source: opted
- 3. Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. -- n. The Ordovician formation. Source: webster
- 4. Of or pertaining to a division of the Silurian formation,corresponding in general to the Lower Silurian of most authors,exclusive of the Cambrian.-- n. Source: adambom
- 5. j:100 n. from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds Source: ecdict
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ordovician
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silurianformationauthorscambriancorrespondingdivisionexclusivegenerallowerpertainingmillionagoalgaeconodontsostracodsseaweedsyears
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